| 摘要 |
An MTJ cell includes a first metal layer elongated in the X-direction; a second metal layer separated from the first metal layer and elongated in the Y-direction; a magnetic tunnel junction (MTJ) interposed between the overlapping parts of the first and second metal layers and having extended parts not covered by the second metal layer, the MTJ including a pinned layer, a barrier layer, and a storage layer sequentially laminated; and a yoke spanning across the second metal layer, with both ends in the X-direction contacting the top surface of the extended parts of the storage layer not covered by the second metal layer, either directly or through an insulator. The planar shapes of the MTJ and the yoke possess a quantum easy axis in the X-direction and Y-direction, respectively. The storage layer at its extended parts possesses a relaxed coupling with the yoke that essentially achieves continuity of flux return directly or indirectly through a nonmagnetic insulating layer, while maintaining a quantum easy axis orthogonal to that of the yoke. The YZ cross-sectional area of the yoke is greater than the YZ cross-sectional area of the storage layer.
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